fix(modem-dev/hunk): support windows/amd64 for >= v0.12.0-beta.2

[elucid]

Check List

• Read CONTRIBUTING.md
  • ⚠️ Avoid force push
  • ⚠️ Use argd s command when adding new packages
• Install and execute the package and confirm if the package works well

The bug

On Windows, aqua i for modem-dev/hunk exits 0 and installs nothing. supported_envs
lists only linux and darwin, so aqua skips the package as unsupported — a skip rather
than an error, so there is no diagnostic and no hunk command afterwards. hunk has
published hunkdiff-windows-x64.tar.gz since v0.12.0-beta.2; this entry predates that.

Fix

• Split the trailing version_overrides entry: semver("<= 0.12.0-beta.1") keeps the
  linux/darwin-only supported_envs, and the "true" entry adds windows/amd64. The
  split is required — appending windows/amd64 to the existing "true" entry turns
  today's silent skip into a hard the asset isn't found: hunkdiff-windows-x64.tar.gz
  failure for every release from v0.6.2 to v0.12.0-beta.1.
• windows/amd64 rather than bare windows, because hunk publishes no Windows arm64
  asset. windows_arm_emulation is not set — untested, so out of scope here.
• No .exe handling is needed: aqua's
  completeWindowsExtToFileSrc
  appends the extension, so the existing src: "{{.AssetWithoutExt}}/hunk" resolves to
  hunkdiff-windows-x64\hunk.exe.
• pkg.yaml: added v0.12.0-beta.2, v0.12.0-beta.1 and v0.11.1 in long syntax, so CI
  covers the new branch and both sides of the boundary. No existing test version was
  removed and the updater-owned modem-dev/hunk@v0.18.0 line is untouched.

Verification

argd t modem-dev/hunk — exit 0. On windows/amd64 it installs v0.12.0-beta.2 and
v0.18.0 and skips v0.12.0-beta.1 / v0.11.1 / v0.6.1; windows/arm64 skips cleanly. Those
are the two windows-latest legs in wc-test.yaml. darwin and linux (amd64 + arm64)
resolve exactly as before this change.

argd t only simulates Windows via AQUA_GOOS, so I also reproduced it on real hardware:

Real Windows reproduction — environment, aqua.yaml, before/after

aqua 2.62.3, Windows 11 Pro 25H2 build 26200, amd64 (env=windows/amd64), PowerShell
5.1. The registry is fetched over aqua's real github_content path pinned to this PR's
head commit, not a local file registry.

---
registries:
  - name: hunk-pr
    type: github_content
    repo_owner: elucid
    repo_name: aqua-registry
    ref: 37434b7b5f86667eaca20ea4d7da8012fd25c7a0
    path: pkgs/modem-dev/hunk/registry.yaml
packages:
  - name: modem-dev/hunk@<VERSION>
    registry: hunk-pr

$env:AQUA_DISABLE_POLICY = "true"   # only because this is not the standard registry
$env:AQUA_ROOT_DIR = "C:\aquapr\<case>\root"
$env:AQUA_CONFIG   = "C:\aquapr\<case>\aqua.yaml"
aqua i; aqua which hunk; hunk --version

Before — current main (ref: 608d3508d9). Expected hunk installed; actual exit 0,
nothing installed:

> aqua i
# (only aqua-proxy) EXIT=0
> aqua which hunk
ERR aqua failed env=windows/amd64 exe_name=hunk error="command is not found"
# EXIT=1

After — this PR:

> aqua i
INF download and unarchive the package env=windows/amd64 package_name=modem-dev/hunk package_version=v0.18.0 registry=hunk-pr
# EXIT=0
> aqua which hunk
C:\aquapr\PR-v0.18.0\root\pkgs\github_release\github.com\modem-dev\hunk\v0.18.0\hunkdiff-windows-x64.tar.gz\hunkdiff-windows-x64\hunk.exe
> hunk --version
0.18.0

aqua which is the interesting line: the entry never mentions .exe, and aqua still
resolved hunk.exe.

Full matrix on windows/amd64 — both sides of the boundary behave as intended:

pinned version	aqua i	installed	hunk --version
v0.18.0	0	hunk.exe	0.18.0
v0.12.0	0	hunk.exe	0.12.0
v0.12.0-beta.2	0	hunk.exe	0.12.0-beta.2
v0.12.0-beta.1	0	(skipped, no error)	—
v0.11.1	0	(skipped, no error)	—
v0.6.1	0	(skipped, no error)	—

Without the version split, the same run against v0.11.1 fails hard:

ERR install the package env=windows/amd64 package_name=modem-dev/hunk package_version=v0.11.1 error="the asset isn't found: hunkdiff-windows-x64.tar.gz"
# EXIT=1

On argd s

I ran argd s modem-dev/hunk rather than hand-editing blind. The generated config omits
files[].src from all three version_overrides branches. hunk's binary is nested inside
a directory in the archive (hunkdiff-linux-x64/hunk), so without files[].src nothing
installs on any platform, and argd t fails on linux/amd64:

ERR check file_src is correct ... package_version=v0.18.1 file_name=hunk
    exe_path=.../hunkdiff-linux-x64.tar.gz/hunk error="check file_src is correct: exe_path isn't found"
ERR argd failed error="Linux/Darwin tests failed: test failed for linux/amd64: exit status 1"

This matches the note in docs/guide.md that files cannot be auto-generated. I
therefore followed docs/guide.md → "Modifying Existing Packages": starting from the
generated output and restoring files[].src yields a config identical to this PR, which
passes argd t cleanly. Two things from the generated output I did not adopt:
windows_arm_emulation: true (hunk ships no Windows arm64 asset, and I have not tested
emulation) and the v0.18.0 → v0.18.1 bump in pkg.yaml (that pin is owned by
aqua-registry-updater).

AI disclosure per docs/ai.md:
prepared with Claude Code, credited as a commit co-author. I reviewed the configuration
and reproduced every result above myself.

[github-actions]

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[github-actions]

@suzuki-shunsuke Ready for review

[suzuki-shunsuke]

Thank you!